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If the alternator is good and the battery is new, then something is draining the battery while it's parked. In the old days people left their headlights, radio or something on and this drained the battery. Now a days this is not as big a problem with 5 minute timers that turn off lights if you forget. I would take it back to whomever did the alternator work for an answer. How old is the battery? You can take it to see if it can't hold a charge any longer. In my experience, most batteries don't seem to hold a charge after about two years. Did anyone do some custom work in your car that requires electricity? It could be this extra stuff is draining the battery.
a healthy battery will take a charge and discharge and be o k -you have several things going on-the ticking noise is some kinda rely that is turning on and off probably because of low voltage-the voltage jumping around sound like the alternator is giving up and is not fully charging battery-you may also have a drain on the battery that doesn't stop when you turn the key off like an extra power amp for the radio- you can take your car to autozone or advanced auto and they will check out the charging system for free and tell you what is going on-cheers Denny
This problem may be a drain or a bad battery or alternator.
The first thing to do before going on trying to find the system that is draining the battery would be to have the battery tested and charging system tested.
A weak battery will seem ok after the car is jumped or will barely start the car and the alternator will charge it even though the alternator is overworking due to weak battery and during the day or when car does not sit long it will seem ok. then when car sits overnight or a few days battery will weaken on its own, making it look like a drain,
so first step is battery test and alternator/charging system test.
Apps and services in the background drain your phone even while in standby mode. Turning off your 3G or 4G connection will deprive you of the internet but it will still permit you to get phone calls. Meanwhile, you are not having apps such as Google constantly draining your power in the background. And they are, even in standby mode. Charge your phone frequently to help preserve battery life.
Generally most batterys are left on the charger overnight, thats a good way to ensure a full charge, but as you will be using it in your car, it doesn't matter much as power is always available.
To ensure best possible battery life when you have a brand new battery, charge it fully and then drain it almost to 0% Draining most batterys into 0% will be harmfull instead of helpful, I assume the nuvi uses a Li-ion battery so draining it fully is not a good idea, drain it almost fully and then charge it fully.
And you are good to go, repeat the process if you leave the unit unused for a month or two for best battery life.
this problem can be caused by many factors. Use of the phone can drain battery life for example if you use the phone for browsing the web or as an mp3 player, even to make or recieve calls the battery life will not be as long as it would if just on standby. also if the battery hasn't been conditioned or is being over charged this can also lead to short battery life.To resolve the problem try conditioning th battery, basically let the charge drain completely out of the phone until the phone actually switches off, then charge the phone for 24 hours. Next time the battery goes ded only charge for the recommended charging time (this info can be found either in your phone user guide or by contacting the customer service department of your network provider).